Queries :: Summary Of Columns In TSQL To Return -1 If Not Equal To 0

Is there an efficient way to return a -1/0 instead of some number/0?

A table has 4 outer joins to views that return a value or null depending on if that field represents a Federal lease.

These 4 outer joins work.

The result is a ID_Wells column and 4 columns with any combination of values or Null.

This line of TSQL:

ISNULL(ISNULL(dbo.vRE_FedLeaseType.Fed_Lease_Type, '')
+ ISNULL(dbo.vRE_FedLeaseMinOwn.MinOwn, '') + ISNULL(dbo.vRE_FedLeaseSurfOwn.SurfOwn, '') + ISNULL(dbo.vRE_FedDirHzLease.Expr1, ''), '') AS HasFedLease

This creates another final summary column [HasFedLease] that returns 0 or some number.

For the Rule Engine - 0 is False, any other number is True.

Access links to this SQL View. Is there a quick way with out a UDF to convert numbers > 0 to a -1?

Code:
SELECT dbo.Wells.ID_Wells, dbo.vRE_FedLeaseType.Fed_Lease_Type, dbo.vRE_FedLeaseMinOwn.MinOwn, dbo.vRE_FedLeaseSurfOwn.SurfOwn,
dbo.vRE_FedDirHzLease.Expr1 AS CountOffedLeaseDirHz, ISNULL(ISNULL(dbo.vRE_FedLeaseType.Fed_Lease_Type, '')

[Code] ......